There has been in increase in cases where the above listed printer series having print quality issues due to a bent or stuck toner drum contact within the inner left side of the printer.

The most common defect is usually referred as “circle” or “bubble print” with varying severities from a thin row down the side(s) of the page (shown below) or mostly full page, depending on how far out of position the contact is.

The main culprit for this is a drum ground contact either bent out of position or pressed in and caught on the printer frame – shown in correct position from inside toner cavity and outside left, with fan removed. Most often times can be manually adjusted back into place.